1. Department of Medical Nursing, School of Nursing, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
2. Department of Epidemiology and Biostatistics, Institute of Public Health, College of Medicine and Health Sciences University of Gondar Gondar Ethiopia
3. Department of Nursing, College of Health Science, Shashamene Campus Madda Walabu University Shashamene Ethiopia
4. School of Health and Welfare Dalarna University Falun Sweden
5. Division of Reproductive Health, Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden
6. Department of Public Health and Caring Sciences Uppsala University Uppsala Sweden